2128538 has 4 divisors (see below), whose sum is σ = 3192810. Its totient is φ = 1064268.

The previous prime is 2128531. The next prime is 2128547. The reversal of 2128538 is 8358212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1776889 + 351649 = 1333^2 + 593^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2128538.

It is not an unprimeable number, because it can be changed into a prime (2128531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532133 + ... + 532136.

2^2128538 is an apocalyptic number.

2128538 is a deficient number, since it is larger than the sum of its proper divisors (1064272).

2128538 is a wasteful number, since it uses less digits than its factorization.

2128538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064271.

The product of its digits is 3840, while the sum is 29.

The square root of 2128538 is about 1458.9509930083. The cubic root of 2128538 is about 128.6353905146.

The spelling of 2128538 in words is "two million, one hundred twenty-eight thousand, five hundred thirty-eight".